Working on a mobile product with a subscription-based model.
For our 6m auto-renewable subscription, we're taking only 1 renewal after the first payment. So, LTV is calculated for 6m + 1 day. For shorter subscriptions, LTV is calculated for 6m. Anything earned beyond that period will be an additional plus.
Pretty conservative approach I would say, but allows us to be on the safer side and more rigorously control our CAC, improve LTV and ensure LTV > CAC.
Worth to mention that it really depends on your business targets and limitations, product peculiarities and the niche you're working in.